If you go to the United website and look at the receipt for the flight in question it will show the class it was booked under. I’m curious because I’ve seen codes in tripmanager I haven’t seen before.
Edited to add I don’t really know what the system we use on the Fedex website to book our own tickets is called. But the receipts we get emailed generally say Y for coach. But if you look on the United website our Y tickets do not always book as Y class. The online booking site has recently started showing letters I’ve never seen before for some tickets. W, E, T, S etc. just wondering if that makes a difference.